#!/usr/bin/env bash
set -e

count_only_flag=''
filter=''
num_jobs=${BATS_NUMBER_OF_PARALLEL_JOBS-1}
have_gnu_parallel=
bats_no_parallelize_across_files=${BATS_NO_PARALLELIZE_ACROSS_FILES-}
bats_no_parallelize_within_files=
flags=('--dummy-flag') # add a dummy flag to prevent unset varialeb errors on empty array expansion in old bash versions

abort() {
  printf 'Error: %s\n' "$1" >&2
  exit 1
}

while [[ "$#" -ne 0 ]]; do
  case "$1" in
  -c)
    count_only_flag=1
    ;;
  -f)
    shift
    filter="$1"
    flags+=('-f' "$filter")
    ;;
  -j)
    shift
    num_jobs="$1"
    flags+=('-j' "$num_jobs")
    ;;
  -T)
    flags+=('-T')
    ;;
  -x)
    flags+=('-x')
    ;;
  --no-parallelize-across-files)
    bats_no_parallelize_across_files=1
    ;;
  --no-parallelize-within-files)
    bats_no_parallelize_within_files=1
    flags+=("--no-parallelize-within-files")
    ;;
  --dummy-flag)
    ;;
  *)
    break
    ;;
  esac
  shift
done

if (type -p parallel &>/dev/null); then
  # shellcheck disable=SC2034
  have_gnu_parallel=1
elif [[ "$num_jobs" != 1 && -z "$bats_no_parallelize_across_files" ]]; then
  abort "Cannot execute \"${num_jobs}\" jobs without GNU parallel"
  exit 1
fi

# create a file that contains all (filtered) tests to run from all files
TESTS_LIST_FILE="${BATS_RUN_TMPDIR}/test_list_file.txt"

all_tests=()
for filename in "$@"; do
  if [[ ! -f "$filename" ]]; then
    abort "Test file \"${filename}\" does not exist"
  fi

  test_names=()
  test_dupes=()
  while read -r line; do
    if [[ ! "$line" =~ ^bats_test_function\  ]]; then
      continue
    fi
    line="${line%$'\r'}"
    line="${line#* }"
    test_line=$(printf "%s\t%s" "$filename" "$line")
    all_tests+=("$test_line")
    printf "%s\n" "$test_line" >>"$TESTS_LIST_FILE"
    # avoid unbound variable errors on empty array expansion with old bash versions
    if [[ ${#test_names[@]} -gt 0 && " ${test_names[*]} " == *" $line "* ]]; then
      test_dupes+=("$line")
      continue
    fi
    test_names+=("$line")
  done < <(BATS_TEST_FILTER="$filter" bats-preprocess "$filename")

  if [[ "${#test_dupes[@]}" -ne 0 ]]; then
    abort "Duplicate test name(s) in file \"${filename}\": ${test_dupes[*]}"
  fi
done

test_count="${#all_tests[@]}"

if [[ -n "$count_only_flag" ]]; then
  printf '%d\n' "${test_count}"
  exit
fi

if [[ -n "$bats_no_parallelize_across_files" ]] && [[ ! "$num_jobs" -gt 1 ]]; then
  abort "The flag --no-parallelize-across-files requires at least --jobs 2"
  exit 1
fi

if [[ -n "$bats_no_parallelize_within_files" ]] && [[ ! "$num_jobs" -gt 1 ]]; then
  abort "The flag --no-parallelize-across-files requires at least --jobs 2"
  exit 1
fi

# only abort on the lowest levels
trap 'BATS_INTERRUPTED=true' INT

trap bats_exit_trap EXIT

bats_exit_trap() {
  if [[ ${BATS_INTERRUPTED-NOTSET} != NOTSET ]]; then
    printf "\n# Received SIGINT, aborting ...\n\n"
  fi
  exit "$status"
}

status=0
printf '1..%d\n' "${test_count}"

# No point on continuing if there's no tests.
if [[ "${test_count}" == 0 ]]; then
  exit
fi

if ! BATS_SUITE_TMPDIR=$(mktemp -d "${BATS_RUN_TMPDIR}/suite-tmpdir-XXXXXX");then
  printf '%s\n' "Failed to create BATS_SUITE_TMPDIR with mktemp" >&2
  exit 1
fi
export BATS_SUITE_TMPDIR

# Deduplicate filenames (without reordering) to avoid running duplicate tests n by n times.
# (see https://github.com/bats-core/bats-core/issues/329)
# If a file was specified multiple times, we already got it repeatedly in our TESTS_LIST_FILE.
# Thus, it suffices to bats-exec-file it once to run all repeated tests on it.
IFS=$'\n' read -d '' -r -a  BATS_UNIQUE_TEST_FILENAMES < <(printf "%s\n" "$@"| nl | sort -k 2 | uniq -f 1 | sort -n | cut -f 2-) || true

if [[ "$num_jobs" -gt 1 ]] && [[ -z "$bats_no_parallelize_across_files" ]]; then
  # run files in parallel to get the maximum pool of parallel tasks
  # shellcheck disable=SC2086,SC2068
  # we need to handle the quoting of ${flags[@]} ourselves,
  # because parallel can only quote it as one
  parallel --keep-order --jobs "$num_jobs" bats-exec-file "$(printf "%q " "${flags[@]}")" "{}" "$TESTS_LIST_FILE"  ::: "${BATS_UNIQUE_TEST_FILENAMES[@]}" 2>&1 || status=1
else
  for filename in "${BATS_UNIQUE_TEST_FILENAMES[@]}"; do
    if [[ "${BATS_INTERRUPTED-NOTSET}" != NOTSET ]]; then
      status=130 # bash's code for SIGINT exits
      break
    fi
    bats-exec-file "${flags[@]}" "$filename" "${TESTS_LIST_FILE}" || status=1
  done
fi

exit "$status"
